Installation Information
Water Piping Connections
Hot Water Generation Connections
Electrical
Startup Procedures
Troubleshooting
Preventive Maintenance
IM1003SN 08/10
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Geothermal/Water Source Indoor Split Heat Pump 2 to 6 Tons Single Speed2 to 6 Tons Dual Capacity
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Table of Contents
Model Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
General Installation Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9
Physical Data - Envision Air Handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Open Loop - Well Water Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Closed Loop - Ground Source Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hot Water Generator Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Thermostat Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Wiring Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-17
Microprocessor Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-21
Operation Logic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
DIP Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23-25
Line Set Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Pressure/Temperature Conversion Chart for R-410A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Thermistor Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Operating Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27-28
Pressure Drop and Recommended Flow Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Unit Startup and Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30-32
Preventative Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Replacement Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Service Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Model Nomenclature
1 2 3 4-6 7 8 9 10 11
N D Z 049 A 1 1 A C
Model Type N = Envision Coax Options
C = CopperCompressor Type N = Cupronickel D = Dual Capacity S = Single Speed Future Option
A = StandardCabinet Configuration Z = Indoor Split Hot Water Option
0 = No Hot Water Generator, No IntelliStart 1 = Hot Water Generator with factory installed pump, No IntelliStart 3 = No Hot Water Generator, IntelliStart 4 = Hot Water Generator with factory installed pump, IntelliStart
Unit Capacity
Vintage A = Current
Voltage 1 = 208-230/60/1
Physical Characteristics
Model 022 030 036 042 048 060 070 026 038 049 064 72
Compressor (1 each) Single Speed Scroll Dual Capacity Scroll
Factory Charge R410a, oz [kg]56
[1.59]56
[1.59]56
[1.59]74
[2.1]90
[2.55]92
[2.61]108
[3.06]52
[1.47]56
[1.59]90
[2.55]92
[2.61]104
[2.95]
Coax and Water Piping
Water Connections Size - Swivel- in [mm] 1 [25.4] 1 [25.4]
HWG Connection Size - Swivel - in [mm] 1 [25.4] 1 [25.4]
Brass Service Valve - Liquid Line - in [mm]3/8
[9.525]1/2
[12.7]3/8
[9.525]1/2
[12.7]
Brass Service Valve - Suction Line - in [mm]5/8
[15.875]3/4
[19.05]7/8
[22.225]5/8
[15.875]3/4
[19.05]7/8
[22.225]
Coax and Piping Water Volume - gal [l]0.7
[2.6]1.0
[3.8]1.3
[4.9]1.3
[4.9]1.6
[6.1]1.6
[6.1]2.3
[8.7]0.7
[2.6]1.3
[4.9]1.6
[6.1]1.6
[6.1]2.3
[8.7]
Weight - Operating, lb [kg]164 [74]
174 [79]
212 [96]
213 [97]
246 [112]
251 [114]
292 [132]
189 [186]
236 [107]
250 [113]
271 [123]
290 [132]
Weight - Packaged, lb [kg]184 [83]
194 [88]
232 [105]
233 [106]
266 [121]
271 [123]
312 [142]
209 [95]
256 [116]
270 [122]
291 [132]
310 [141]
10/29/08NOTES: All units have TXV expansion devices, and 1/2 in. [12.2 mm] and 3/4 in. [19.1 mm] electrical knockouts. Brass service valves are sweat type valves.
5
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Physical Dimensions
Dimensions are in inches.Decorative molding and water connections extend 1.2 in. [30.5 mm] beyond the front of the cabinet.Refrigerant line connections extend 2 in. [50.8 mm] beyond the front of the cabinet.
ModelHeight Width Depth Water In Water Out
Service ValveHWG In HWG Out
Low Voltage
External Pump
Line VoltageLiquid Gas
A B C D E F G H J K L M
022-030 19.25 22.50 26.50 1.93 6.93 8.44 11.55 13.43 16.43 8.55 10.30 11.80
038-072 21.25 25.50 31.50 2.21 7.21 9.21 12.14 15.83 18.83 7.71 9.46 10.96
A
C
B
D
EF
GH
J
KL
M
6
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair or service heating and air conditioning equipment. Untrained personnel can perform the basic maintenance functions of cleaning coils and cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on heating and air conditioning equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may apply, such as the following safety measures:
Follow all safety codes.• Wear safety glasses and work gloves.• Use a quenching cloth for brazing operations.• Have a fire extinguisher available for all brazing operations.•
Moving and StorageMove units in the normal “up” orientation. Units may be moved and stored per the information on the packaging. Do not stack more than three units in total height. Do not attempt to move units while stacked. When the equipment is received, all items should be carefully checked against the bill of lading to be sure all crates and cartons have been received. Examine units for shipping damage, removing the units from the packaging if necessary. Units in question should also be internally inspected. If any damage is noted, the carrier should make the proper notation on the delivery receipt, acknowledging the damage.
Unit Location Locate the unit in an indoor area that allows for easy removal of the access panels. Location should have enough space for service personnel to perform maintenance or repair. Provide sufficient room to make water, electrical and refrigerant line connections. Any access panel screws that would be difficult to remove after the unit is installed should be removed prior to setting the unit. Care should be taken when units are located in unconditioned spaces to prevent damage from frozen water lines and excessive heat that could damage electrical components.
Air Coil LocationRefer to the air handler manufacturer’s instructions for the blower coil unit for details on installing the air handling portion of the system.
Condensate DrainFollow the blower coil manufacturer’s instructions.
WARNING: Before performing service or maintenance operations on a system, turn off main power switches to the indoor unit. If applicable, turn off the accessory heater power switch. Electrical shock could cause personal injury.
Safety Considerations Duct SystemAll blower coil units/air coils must be installed as specified by the manufacturer’s installation instructions; however, the following recommendations should be considered to minimize noise and service problems.
An air filter must always be installed upstream of the air coil on the return air side of the air handler or furnace. If there is limited access to the filter rack for normal maintenance, it is suggested that a return air filter grill be installed. Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the filter and plugging the air coil.
In applications using galvanized metal ductwork, a flexible duct connector is recommended on both the supply and return air plenums to minimize vibration from the blower. To maximize sound attenuation of the unit blower, the supply and return plenums should include an internal duct liner of 1-inch thick glass fiber or be constructed of ductboard. Insulation is usually not installed in the supply branch ducts. Ducts in unconditioned areas should be wrapped with a minimum of 1-inch duct insulation. Application of the unit to uninsulated ductwork in an unconditioned space is not recommended as the unit’s performance will be adversely affected. If the air handler is connected to existing ductwork, a previous check should have been made to assure that the duct system has the capacity to handle the air required for the unit application. If ducting is too small, as in replacement of heating only systems, larger ductwork should be installed. All existing ductwork should be checked for leaks and repairs made accordingly. The duct systems and diffusers should be sized to handle the design airflow quietly. If air noise or excessive airflow is a problem, the blower speed can be changed to a lower speed to reduce airflow. This will reduce the performance of the unit slightly in heating; however, it will increase the temperature rise across the air coil. Airflow must still meet minimum requirements.
Equipment SelectionThe following guidelines should be used when mating an Envision Split to an air handler/coil.
Select R-410A components only.• Select 13 SEER or higher air handler/coil.• Match the air handler to the air handler coil data table.• Indoor matching adjustable TXV should be used with • any air handler/coil. Fixed orifice or cap tube systems should not be used.
Utilizing Existing Coil or Air HandlerIt is recommended that a new R-410A air handler be installed with an Envision Split considering the long term benefits of reliability, warranty, etc. versus the short term installation cost savings. However, the existing air handler may be retained provided the following:
Coil currently is R-410A rated• Coil uses a TXV. No capillary or fixed orifice systems • should be used
General Installation Information
7
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
A life expectancy of more than 7 years remaining for the • air handler and componentsFlush air coil and line set•
When utilizing the existing air coil or line set, only flushing compounds that vaporize should be used; which means they are packaged in a pressurized disposable cylinder. It is preferable to use a flushing agent that removes oil, water, and acid, plus, is biodegradeable and non-toxic. The flushing agent should be safe to use with both HCFC and HFC refrigerants. Once a flushing agent has been selected, follow the instructions provided with the product.
The first step should be purging the lines or air coil with nitrogen. Purging with nitrogen first will remove some of the particulate and residual oil which will allow the flushing agent to work better. Never blow the flushing agent through a compressor, filter drier, or txv as it will cause the components to fail.
When flushing is complete and the final system is assembled, an acid check should be preformed on the system. Acid test kits are available from most HVACR distributors.
Connection to Air CoilFigures 1 and 2 illustrate typical Envision Split installations. Reference the Line Set Sizes table for typical line set diameters and maximum length. Line sets over 60 feet are not recommended. Longer line sets will significantly reduce capacity and efficiency of the system as well as adversely effect the system reliability due to poor oil return. If the line set is kinked or deformed and cannot be reformed, the bad section of pipe should be replaced. A restricted line set will affect unit performance. As in all R-410A equipment, a reversible liquid line filter drier is required to insure all moisture is removed from the system. This drier should be replaced whenever “breaking into” the system for service. All
line sets should be insulated with a minimum of 1/2 in. closed cell insulation. All exterior insulation should be painted with UV resistant paint or covering to ensure long insulation life.
Air Handler InstallationAir handlers used with dual capacity units must be capable of operating with a minimum of 2 blower speeds. Refer to the manufacturer’s instructions for the blower coil unit for details on installing the air handling portion of the system. All blower coil units/air coils must be installed as specified by the manufacturer’s installations instructions. However, the following recommendations should be considered to minimize noise and service problems.
An air filter must always be installed upstream of the air coil on the return air side of the air handler or furnace. If there is limited access to the filter rack for normal maintenance, it is suggested that a return air filter grille be installed. Be sure that the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the filter and plugging the air coil.
Ensure that the line set size is appropriate to the capacity of the unit (refer to Line Set Sizes table). Line sets should be routed as directly as possible, avoiding unnecessary bends or turns. All wall penetrations should be sealed properly. Line set should not come into direct contact with water pipes, floor joists, wall studs, duct work, floors, walls and brick. Line set should not be suspended from joists or studs with a rigid wire or strap which comes into direct contact with the tubing. Wide hanger strips which conform to the shape of the tubing are recommended. Isolate hanger straps from line set insulation by using metal sleeves bent to conform to the shape of insulation. Line set insulation should be pliable, and should completely surround the refrigerant line.
NOTES: Improper installation of equipment may result in undesirable noise levels in the living areas.
Disconnect
Thermostat WireFrom Air Handler
Vibration Absorbing Pad or Air Pad
P/T PlugsWater OutWater In
Lineset To Air Handler
Insulated Suction Line
SupplyDuct
Wire ToThermostat
ReturnDuct
Condensate Drain(must be trapped)
To Drain
Remote Air Handler(Maximum Recommended Distance is
60' Between Units)DHW InDHW Out
Figure 1: Typical Split System Application with Remote Blower Coil
General Installation Information cont.
8
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Dual Fuel SystemsEnvision units can be connected to fossil fuel furnaces that
include an A-coil or slab coil. Dual fuel installations utilize
the Envision heat pump for heating until the point that aux-
iliary heat is called for on the thermostat. At that point, the
furnace will be enabled and the heat pump will be disabled.
The Envision heat pump provides air conditioning through
the furnace’s refrigerant coils.
Refer to the furnace manufacturer’s installation manual
for the furnace installation, wiring and coil insertion. A
WaterFurnace Dual Fuel thermostat, a field-installed DPST
relay or dual capacity auxiliary heat relay is required. See
Figure 2 for typical Dual Fuel application.
Disconnect
ThermostatWire From Furnace
Vibration Absorbing Pad or Air Pad
P/T Plugs
Wire ToThermostat
Up-FlowFossil Fuel
Furnace
CondensateDrain
(must be trapped)
"A" orSlab Coil
Supply Duct
Air Temperature Limit Switch - to prevent compressor operationwhen entering air is greater than90°F.
Water Out
Water In
Lineset To Air Handler
InsulatedSuction Line
DHW In
ReturnDuct
DHW Out
Maximum Recommended Distanceis 60' Between Units
Figure 2: Typical Split System Heat Pump Coil Add-On Fossil Fuel Furnace
In add-on Envision Split applications, the coil should be
located in the supply side of the furnace to avoid con-
densation damage to the furnace heat exchanger. A high
temperature limit should be installed upstream of the coil
to de-energize the compressor whenever the furnace is
operating. Without this switch, the Envision Split will trip
out on high pressure. A dual fuel thermostat can remove
the Y1 and Y2 calls when a W call is energized to allow gas
furnace backup on an Envision Split application. Refer to
thermostat wiring diagram for details.
General Installation Information cont.
9
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Water PipingThe proper water flow must be provided to each unit
whenever the unit operates. To assure proper flow, use
pressure/temperature ports to determine the flow rate.
These ports should be located at the supply and return
water connections on the unit. The proper flow rate cannot
be accurately set without measuring the water pressure
drop through the refrigerant-to-water heat exchanger.
All source water connections on residential units are
swivel piping fittings (see Figure 3) that accept 1 in. male
pipe threads (MPT). The swivel connector has a rubber
gasket seal similar to a rubber hose gasket, which when
mated to the flush end of any 1 in. threaded pipe provides
a leak-free seal without the need for thread sealing tape
or compound. Check to ensure that the rubber seal is in
the swivel connector prior to attempting any connection.
The rubber seals are shipped attached to the waterline.
To make the connection to a ground loop system, mate
the brass connector (supplied in CK4L connector kit)
against the rubber gasket in the swivel connector and
thread the female locking ring onto the pipe threads, while
maintaining the brass connector in the desired direction.
Tighten the connectors by hand, then gently snug the
fitting with pliers to provide a leak-proof joint. When
connecting to an open loop (ground water) system, thread
the 1 in. MPT fitting (SCH80 PVC or copper) into the swivel
connector and tighten in the same manner as noted above.
The open and closed loop piping system should include
pressure/temperature taps for serviceability.
LockingRing
StainlessSteelSnap Ring
GasketSupportSleeve
GasketMaterial
Figure 3: Swivel Connections (Residential Units)
General Installation Information cont.
Never use flexible hoses smaller than 1 in. inside diameter
on the unit. Limit hose length to 10 ft. per connection.
Check carefully for water leaks.
Air Handler Sizing SelectionThe Envision Air Handlers are designed for R410a refrigerant and should be matched with Envision Split series compressor
section according to the table below.
Air HandlerIndoor Split Model
(Single)Indoor Split Model
(Dual Capacity)Outdoor Split Model
(Dual Capacity)Airflow(CFM) Electric Heat (kW)
NAH022A***1R NSZ022 - 800 5
NAH026A***1R - NDZ026 NDS026 925 5
NAH030A***1R NSZ030 - - 980 5, 10
NAH036A***1R NSZ036 - - 1225 5, 10
NAH036A***1R - NDZ038 NDS038 1225 5, 10
NAH042A***1R NSZ042 - - 1425 10, 15
NAH048A***1R NSZ048 - - 1625 10, 15
NAH048A***1R - NDZ049 NDS049 1625 10, 15
NAH060A***1R NSZ060 - - 1760 10, 15, 20
NAH060A***1R - NDZ064 NDS064 1760 10, 15, 20
NAH060A***1R NSZ070 - - 1760 10, 15, 20
NAH060A***1R - NDZ072 NDS072 1760 10, 15, 20
6/9/08
10
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Typical open loop piping is shown below. Always maintain
water pressure in the heat exchanger by placing water
control valves at the outlet of the unit to prevent mineral
precipitation. Use a closed bladder type expansion tank
to minimize mineral formation due to air exposure. Ensure
proper water flow through the unit by checking pressure
drop across the heat exchanger and comparing it to the
figures in the unit capacity data tables in the specification
catalog. Usually 1.5-2 GPM of flow per ton of cooling
capacity is recommended in open loop applications. In
dual capacity units, stage 1 is 70% of the total tonnage.
Therefore, due to only minor differences in flow rate from
low to high, only one solenoid valve should be used. The
valve should be sized for full flow.
Figure 4: Typical Split System Application Open Loop - Well Water
Disconnect
Thermostat WireFrom Air Handler
Vibration Absorbing Pad or Air Pad
P/T Plugs
Boiler Drains forSystem Flushing
Water SolenoidControl Valve
Rubber BladderPressure Tank
LinesetTo Air Handler
FlowRegulator
Shut-Off Valves
Water OutWater InFrom W ell
Acc Com
Acc NC
Acc NO
1
2
3
C
RP1
P3
SV
SolenoidValve
CC-GND
CC
CCHI
ComfortAlert
Y1
Y2Logic Board
Violet(3)
Blk(1)
Wht(4)
VM valve
Violet(2)
CC
SV
Figure 9b: Open Loop Solenoid Valve Connection OptionTypical slow operating external 24V water solenoid valve(type VM) wiring.
Figure 5: Open Loop Solenoid Valve Connection OptionTypical quick operating external 24V water solenoid valve(type PPV100 or BPV100) wiring.
Open Loop - Well Water SystemsDischarge water from the unit is not contaminated in any
manner and can be disposed of in various ways depending
on local building codes (i.e. recharge well, storm sewer,
drain field, adjacent stream or pond, etc.). Most local codes
forbid the use of sanitary sewer for disposal. Consult
your local building and zoning departments to ensure
compliance in your area.
NOTES: For open loop/groundwater systems or systems
that do not contain an antifreeze solution, set SW2-
Switch #2 to the “WELL” position (Refer to the DIP Switch
Settings table.) Slow opening/closing solenoid valves (type
VM) are recommended to eliminate water hammer.
11
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Solenoid WiringWater control valves draw their power directly from a unit’s
24V transformer and can overload and possibly burn out
the transformer. Check total VA draw of the water valve
and ensure that it is under 15 VA.
Open Loop - Well Water Systems cont.
In ground water situations where scaling could be heavy
or where biological growth such as iron bacteria will be
present, a closed loop system is recommended. The heat
exchanger coils in ground water systems may, over a period
of time, lose heat exchange capabilities due to a buildup
of mineral deposits inside. These can be cleaned, but only
by a qualified service mechanic, as special solutions and
Water Quality
pumping equipment are required. Hot water generator coils
can likewise become scaled and possibly plugged. In areas
with extremely hard water, the owner should be informed
that the heat exchanger may require occasional flushing.
Failure to adhere to the guidelines in the water quality table
could result in loss of warranty.
Note: Grains = PPM divided by 17 mg/l is equivalent to PPM
leetS sselniatS 613lekciN-orpuC 01/09reppoClairetaM
pH Acidity/Alkalinity 9 - 7 9 - 7 9 -7
Scaling Calcium and Magnesium Carbonate (Total Hardness) less than 350 ppm (Total Hardness) less than 350 ppm (Total Hardness) less than 350 ppm
Hydrogen Sulfide Less than .5 ppm (rotten egg smell appears at 0.5 PPM)
mpp 1 naht sseLmpp 05 - 01
mpp 002 naht sseLmpp 521 naht sseLmpp 521 naht sseLsetafluSmpp 5. naht sseLmpp 5. naht sseLmpp 5. naht sseLenirolhCmpp 003 naht sseLmpp 521naht sseLmpp 02 naht sseLsedirolhC
mpp 05 -01mpp 05 - 01mpp 05 naht sseLedixoiD nobraCmpp 02 naht sseLmpp 2 naht sseLmpp 2 naht sseLainommA
Corrosion mpp 5. naht sseLmpp 5. naht sseLmpp 5. naht sseLedirolhC ainommAmpp 5. naht sseLmpp 5. naht sseLmpp 5. naht sseLetartiN ainommAmpp 5. naht sseLmpp 5. naht sseLmpp 5. naht sseLedixordyH ainommAmpp 5. naht sseLmpp 5. naht sseLmpp 5. naht sseLetafluS ainommA
mpp 0051-0001mpp 0051-0001mpp 0001 naht sseL)SDT( sdiloS devlossiD latoTLSI Index +0.5 to -.05 +0.5 to -.05 +0.5 to -.05
Iron FoulingBacterial Iron Potential
mpp 2. < mpp 2. < mpp2. <
(Biological Growth) Iron Oxide Less than 1 ppm. Above this level deposition will occur.
Less than 1 ppm. Above this level deposition will occur.
Less than 1 ppm. Above this level deposition will occur.
Erosion Suspended Solids Less than 10 ppm and filtered for max of 600 micron size
Less than 10 ppm and filtered for max of 600 micron size
Less than 10 ppm and filtered for max of 600 micron size
ces/tf 6<ces/tf 6 <ces/tf 6 < )retaW hserF( yticoleV dlohserhT
12
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
NOTE: For closed loop systems with antifreeze protection, set
SW2-2 to the “loop” position (see DIP Switch Settings table).
Once piping is completed between the unit, pumps and the
ground loop (see figure below), final purging and charging
of the loop is required. A flush cart (or a 1.5 HP pump
minimum) is needed to achieve adequate flow velocity
in the loop to purge air and dirt particles from the loop
itself. Antifreeze solution is used in most areas to prevent
freezing. Flush the system adequately to remove as much
air as possible then pressurize the loop to a static pressure
of 40-50 PSI (summer) or 50-75 PSI (winter). This is
normally adequate for good system operation. Loop static
pressure will fluctuate with the seasons. Pressures will be
higher in the winter months
than during the cooling season.
This fluctuation is normal and
should be considered when
initially charging the system.
After pressurization, be sure
to remove the plug in the end
of the loop pump motor(s) (if
applicable) to allow trapped air
to be discharged and to ensure
that the motor housing has been
flooded. Ensure that the loop
pumps provide adequate flow
through the unit(s) by checking
the pressure drop across the
heat exchanger and comparing
it to the unit capacity data
in the specification catalog.
Usually 2.5 to 3 GPM of flow
per ton of cooling capacity is
recommended in earth loop
applications.
Figure 7: Typical Split System Application Closed Loop - Earth Coupled
Disconnect
Thermostat WireFrom Air Handler
Vibration Absorbing Pad or Air Pad
P/T Plugs
LinesetTo AirHandler
Insulated
Flow CenterElectrical Supply
GeoLinkFlow Center
To Loop
DHW Out
Rubber Hose ConnectorKit CK4L or CK4S
DHW In
Envision toElectromechanical Units
ShutDown C C SL1
InSL1Out
Envision Unit #1
To Electromechanical Unit
C S
ShutDown C C
ShutDown C C
SL1In
SL1Out
SL1In
SL1Out
Single SpeedEnvision Unit #1
With pumpwired to Unit 1
With pumpwired toUnit 2
Envision to EnvisionMicroprocessor Units
Envision Unit #2Single Speed
With pumpwired to Unit 1
With pumpwired toUnit 2
ShutDown C C
ShutDown C C
SL1In
SL1Out
SL1In
SL1Out
Dual CapacityEnvision Unit #1
Envision Unit #2Dual Capacity
Envision to EnvisionMicroprocessor Units
Figure 8: Primary/Secondary Hook-up
Closed Loop - Ground Source Systems
Multiple Units on One Flow CenterWhen two units are connected to one loop pumping
system, pump control is automatically achieved by
connecting the SL terminals on connector P2 in both units
with 2-wire thermostat wire. These terminals are polarity
dependant (see Figure 8). The loop pump(s) may be
powered from either unit, whichever is more convenient. If
either unit calls, the loop pump(s) will automatically start.
The use of two units on one flow center is generally limited
to a total of 20 GPM capacity.
13
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Figure 11: Hot Water Generator Installation in Preheat Tank
Figure 10: Typical Hot Water Generator Installation
Drain Valve
In
P/T ReliefValve
ColdWater In
HotWater Out
DHWWater In
DHWWater Out
Venting Waste Valveor Vent Coupling
3/4˝ x 3/4˝ x 1/2˝ tee
Drain Valve Drain Valve
In
P/T ReliefValve
Venting Waste Valve or Vent Coupling
DHW
DHW
3/4˝ x 3/4˝ x 1/2˝ tee
Water In
HotWater Out
ColdWater In
Water OutP/T Relief
Valve
The heat reclaiming hot water generator coil is vented
double-wall copper construction and is suitable for potable
water. To maximize the benefits of the hot water generator
a minimum 50-gallon water heater is recommended. For
higher demand applications, use an 80-gallon water heater
or two 50-gallon water heaters connected in a series as
shown below. A geo storage tank should not be used in this
application unless it is plumbed in a series with an electric
water heater. The geo storage tank is equipped with a
single 4500 Watt element and will not be able to provide
adequate water heating if used as a standalone water
heater. Electric water heaters are recommended. Make sure
all local electrical and plumbing codes are followed when
installing a hot water generator. Residential units with hot
water generators contain an internal circulator and fittings. A
water softener is recommended for hard water applications
(greater than 10 grains or 170 ppm total hardness).
CAUTION: Elements will burn out if energized dry.
Water Tank PreparationTo install a unit with hot water generator, follow these
installation guidelines.
Turn off the power to the water heater.1.
Attach a water hose to the water tank drain connection 2.
and run the other end of the hose to an open drain or
outdoors.
Close the cold water inlet valve to the water heater 3.
tank.
Drain the tank by opening the valve on the bottom 4.
of the tank, then open the pressure relief valve or hot
water faucet.
Hot Water Generator ConnectionsNOTE: Under certain conditions, Envision dual capacity
units operate with very low refrigerant discharge
temperatures, producing little or no water heating
capability. This scenario occurs when the unit is operating
with cold entering source water (loop or well). Allowing
the hot water generator pump to operate during
these conditions actually removes heat from the DHW
circulating through the unit. To overcome this, Envision unit
microprocessors have been programmed to disengage the
hot water generator pump during such conditions. (During
low capacity cooling operation, the pump will operate only
if the DHW temperature entering the unit is less than the
liquid line temperature plus 35° F. During high capacity
cooling operation, the pump will operate only if the DHW
temperature is less than the liquid line temperature plus
60°F.) Using a preheat tank, as shown in Figure 11, will
maximize hot water generator capabilities.
Flush the tank by opening the cold water inlet valve to 5.
the water heater to free the tank of sediments. Close
when draining water is clear.
Disconnect the garden hose and remove the drain 6.
valve from the water heater.
Refer to Plumbing Installation and Hot Water Generator 7.
Startup.
14
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Plumbing InstallationInspect the dip tube in the water heater cold inlet 1.
for a check valve. If a check valve is present it must
be removed or damage to the hot water generator
circulator will occur.
Remove drain valve and fitting.2.
Thread the 3/4-inch NPT x 3-1/2-inch brass nipple into 3.
the water heater drain port.
Attach the center port of the 3/4-inch FPT tee to the 4.
opposite end of the brass nipple.
Attach the 1/2-inch copper to 3/4-inch NPT adaptor to 5.
the side of the tee closest to the unit.
Install the drain valve on the tee opposite the adaptor.6.
Run interconnecting tubing from the tee to DHW water 7.
out.
Cut the cold water “IN” line going to the water heater.8.
Insert the reducing solder tee in line with cold water 9.
“IN” line as shown.
Run interconnecting copper tubing between the unit 10.
DHW water “IN” and the tee (1/2-inch nominal). The
recommended maximum distance is 50 feet.
To prevent air entrapment in the system, install a vent 11.
coupling at the highest point of the interconnecting
lines.
Insulate all exposed surfaces of both connecting water 12.
lines with 3/8-inch wall closed cell insulation.
NOTE: All plumbing and piping connections must comply
with local plumbing codes.
CAUTION: Never operate the DHW circulating pump while dry. If the unit is placed in operation before the hot water generator piping is connected, be sure that the pump switch is set to the OFF position.
Hot Water Generator Connections cont.
Hot Water Generator StartupClose the drain valve to the water heater.1.
Open the cold water supply to the tank.2.
Open a hot water faucet in the building to bleed air 3.
from the system. Close when full.
Open the pressure relief valve to bleed any remaining 4.
air from the tank, then close.
If so equipped, unscrew the indicator plug 1 turn on 5.
the motor end of the pump until all air is purged from
the pump, then tighten the plug. Use vent couplings to
bleed air from the lines.
Carefully inspect all plumbing for water leaks and 6.
correct as required.
Before restoring electrical supply to the water heater, 7.
adjust the temperature setting on the tank.
On tanks with both upper and lower elements, •
the lower element should be turned down to
the lowest setting, approximately 100°F. The
upper element should be adjusted to 120°F to
130°F. Depending upon the specific needs of
the customer, you may want to adjust the upper
element differently.
On tanks with a single element, lower the •
thermostat setting to 120°F.
After the thermostat(s) is adjusted, replace the access 8.
cover and restore electrical supply to the water heater.
Make sure that any valves in the hot water generator 9.
water circulating circuit are open.
Turn on the unit to first stage heating. 10.
The DHW pump should be running. When the pump 11.
is first started, open the inspection port 1 turn (if
equipped) until water dribbles out, then replace. Allow
the pump to run for at least five minutes to ensure that
water has filled the circulator properly. Be sure the
switch for the DHW pump (SW4) is “ON”. The DHW
“OFF” LED on the unit should not be illuminated.
The temperature difference between the water 12.
entering and leaving the hot water generator should be
5°F to 15°F. The water flow should be approximately
0.4 GPM per ton of nominal cooling.
Allow the unit to heat water for 15 to 20 minutes to be 13.
sure operation is normal.
15
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Electrical Data
ModelRated
VoltageVoltageMin/Max
Compressor HWAPumpFLA
ExtLoopFLA
TotalUnitFLA
MinCircAmp
MaxFuse/HACRMCC RLA LRA LRA*
022 208-230/60/1 197/253 14.0 9.0 48.0 17.0 0.4 5.4 14.8 17.1 25
030 208-230/60/1 197/253 20.0 12.8 58.3 21.0 0.4 5.4 18.6 21.8 30
036 208-230/60/1 197/253 22.0 14.1 73.0 26.0 0.4 5.4 19.9 23.4 35
042 208-230/60/1 197/253 26.0 16.6 79.0 28.0 0.4 5.4 22.4 26.6 40
048 208-230/60/1 197/253 31.0 19.8 109.0 38.0 0.4 5.4 25.6 30.6 50
060 208-230/60/1 197/253 41.2 26.4 134.0 47.0 0.4 5.4 32.2 38.8 60
070 208-230/60/1 197/253 47.0 30.1 158.0 55.0 0.4 5.4 35.9 43.4 70
026 208-230/60/1 197/253 16.0 10.2 52.0 18.0 0.4 5.4 16.0 18.6 25
038 208-230/60/1 197/253 26.0 16.6 82.0 29.0 0.4 5.4 22.4 26.6 40
049 208-230/60/1 197/253 33.0 21.1 96.0 34.0 0.4 5.4 26.9 32.2 50
064 208-230/60/1 197/253 40.0 25.6 118.0 41.0 0.4 5.4 31.4 37.8 60
072 208-230/60/1 197/253 42.5 27.2 150.0 53.0 0.4 5.4 33.0 39.8 60
5/6/09Rated voltage of 208-230/60/1HACR circuit breaker in USA onlyMin/Max Voltage of 197/253All fuses Class RK-5* With optional IntelliStart
Thermostat WiringSingle and Dual Capacity Wiring Diagram
Field low voltage point to point wiring:From
Thermostat To Air HandlerTo Compressor
SectionC C CR R RG GO O OY1 Y1 Y1Y2 Y2 Y2W2 WL L
Air Handler transformer must be 75VA. 5/29/08
Be sure the available power is the same voltage and phase
as that shown on the unit serial plate. Line and low voltage
wiring must be done in accordance with local codes or the
National Electric Code, whichever is applicable. See unit
electrical data for fuse or circuit breaker sizing information.
16
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Wiring SchematicsDual Capacity Split Wiring Schematic - 208-230/60/1
HWL
HP
LP
FD
97P774-31 12 /8/08
Stat
us L
ED P
CB
SW4
R
R
R
R
R
G
Y
R
T
T
240V L2240V L1240V L2
P6
Premier 2Microprocessor Logic Control (DC Voltage)
P1
Fused L2
R
C
CC-GND
NO
CR2 COM
F1-10A 240V
Fused L2
NO
CR1 COM
1
2
3
4
5
6
7
8
1
2
3
P4
Pink
Black
Blue
Orange
Orange
Pink
Yellow
Yellow
1
2
3C
P2
Down
C
1
2
3
4
5
6
7
Shut
SL1 In
Not
SL1 Out
Used
NOTE 1
Acc Com
Acc NC
Acc NO
1
2
3
P3
1 2 3Main Logic PCB
F1-10A 240V
Tan
6
5
4
8
7
P5
12
1
2
9
10
3
4
9
11
2
10
8
1
12
5
3
13
14
15
16
11
G
W
O
R
C
Y1
Y2
LO
OnSW1
1 2 3 4
5 6 7
8 9
10
11 12
ECM2 Air Flow Settings
Black
Blue
14
13
6
7
CC
NO NC
CR4 COM
NO NC
CR3 COM
RV
CCHI
Not Used
Not Used
OnSW3OnSW2
1
2 3 4
5 6
7 8
No Htg3 / Htg3
Dehum / Norm
Fan / CompLoop / WellTest / Norm
Outputs / NormInputs / Norm
2 Speed / 1 Speed
Normal / Finish on 2nd (Note 2)No RPM / RPMElectric Heat / NormalEnvision / E Series or Premier
1
2 3 4
5
Pulse L / Constant L (NOTE 4)
Field Selection Dips - #1 On, #6 On, #7 On Drain pan overflow Lockout FD thermistor (loop<15°F,well<30°F) Lockout
High Pressure Low Pressure / Comfort Alert ECM2 RPM < 100 rpm Lockout
Microprocessor malfunction* HWL thermistor > 130°F DHW pump switch off
Drain Water Flow
High Press Low Press / CAAir Flow
Status DHW Limit DHW off
LED Normal Display Mode
#1 Off, #6 On, #7 On Drain pan overflow FD thermistor (loop<15°F, well< 30°F)
High Pressure Low Pressure / Comfort Alert ECM2 RPM < 100 rpm
Not Used HWL thermistor > 130°F DHW pump switch off
Current Fault Status
#6 Off, #7 On Y1 Y2
O G W
SL1 SL2--
Inputs
#6 On, #7 Off Compressor Lo Compressor Hi
RV FAN
DHW Pump
Loop Pump 1 Loop Pump 2
--
Outputs
#6 Off, #7 Off Blower Lo
Blower Med
Blower Hi Aux Heat #1 Aux Heat #2
AuxHeat #3 Aux Heat #4
--
Outputs 2
Diagnostic Modes
*Green LED not flashing
Thermistor
Light emitting diode - Green
Relay coil
Capacitor w/ bleed resistor
Switch - Condensate overflow
Switch - High pressure
Switch - Low pressure
Switch -Hot Water On /Off
Polarized connector
Factory Low voltage wiringFactory Line voltage wiringField low voltage wiringField line voltage wiringOptional blockDC Voltage PCB tracesInternal junctionQuick connect terminal
Wire nut
Field wire lug
Ground
Fuse
CC -CO -CR 1 -CR 2 -CR 3 -CR 4 -
F1 and F2 -
FD -
HE -HP -
LP -PB1, PB2 -PS -RV -SW1 -SW2 -SW3 -SW4 -TS -
Compressor ContactorCondensate overflow sensorDHW pump relayLoop pump relay
Fuses
Freeze Detection Sensor
Heater elementHigh pressure switch
Low pressure switchPower blocksPower stripReversing Valve coilDIP package 12 positionDIP package 8 positionDIP package 5 positionHot water pump enable switchThermal limit switch
Legend
Relay Contacts -N.O., N.C.
G
T
132P
L1
PSC Fan Speed RelayPSC Fan Power Relay
ER 1 to ER4 - Aux heat stage relays
HWL - Hot water limit sensorSC - Start Contactor
Start RelaySR -
CS - Compressor Solenoid **DC Coil**
CA - Comfort Alert
Y1
Y2
O
R
C
L
C
R
Fossil Fuel Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Signal
Reversing Valve
2 nd Stage Compressor
1st Stage CompressorY1
Y2
O
R
C
LO
EZ Split
GGFan
W
W
Auxiliary Heat Relay
Duel Fuel Wiring DiagramUsing Field Installed Relay
Note : Field installed DPST dual fuel relay ( Required for dual fuel installation )
Auxiliary Heat Relay
P2
P1
Shut
Auxiliary Heat Relay
Down
= chassis
LED Flash Code DescriptionGreen Solid Module Has PowerRed Solid Y1 Present But Compressor Not Running
Code 1 Long Run TimeCode 2 System Pressure TripCode 3 Short CyclingCode 4 Locked RotorCode 5 Open CircuitCode 6 Open Start CircuitCode 7 Open Run CircuitCode 8 Welded ContactorCode 9 Low Voltage
Yellow
Comfort Alert Status
NO
T U
SE
D
NOTE 5
DHW Pump
Blu
3AFuse Pink
Blu(17)
Ext Pump 1/2 hp Total 208-230/60/1
Pump Pump
G
2
1
PB1
1
2
Yel(8)
Pink(13)
Unit Power 208-230/60/1
GL2 L1
CC
CS
R
RunCapacitor
Red BlackBlue
Tan(16)
Comfort Alert
CC
Blk(1 )
Violet(2)
Comfort Alert
R
Y
C
Violet(3)
Blk(5)Yel(6)
L Comfort AlertNOTE 3
CS +-
DC SOL
Wht(4)
Brn(15)Org(14)
Gry(9)
C
NOTE 6
SL1 In
SL1 Out
Optional
Remote Unit Without
Loop Pump
Y2
Notes:1 - 24V Accessory relay (see SW2-3 for description of operation)2 - This Switch allows the unit to down stage with the t-stat when OFF and finish on second stage when ON. Finish second stage reduces stage changing in recip dual capacity compressors and should be ON for unzoned Dual Cap E-Series or Premier 2 speed units. 3 - Comfort Alert fault output to Premier Control Board 4 - SW2-8 must be in the OFF position for pulsed “L” lockout signal and in the ON position for constant “L” lockout signal. 5 - DHW pump only in models with hot water generation option.6 - Connection of remote unit that does not have a loop pump for slave operation.
17
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Wiring Schematics cont.Single Speed Split Wiring Schematic - 208-230/60/1
HWL
HP
LP
FD
97P774-30 12/8/08
Stat
us L
ED P
CB
SW4
R
R
R
R
R
G
Y
R
T
T
240V L2240V L1240V L2
P6
Premier 2Microprocessor Logic Control (DC Voltage)
P1
Fused L2
R
C
CC-GND
NO
CR2 COM
F1-10A 240V
Fused L2
NO
CR1 COM
1
2
3
4
5
6
7
8
1
2
3
P4
Pink
Black
Blue
Orange
Orange
Pink
Yellow
Yellow
1
2
3C
P2
Down
C
1
2
3
4
5
6
7
Shut
SL1 In
Not
SL1 Out
Used
NOTE 1
Acc Com
Acc NC
Acc NO
1
2
3
P3
1 2 3Main Logic PCB
F1-10A 240V
Tan
6
5
4
8
7
P5
12
1
2
9
10
3
4
9
11
2
10
8
1
12
5
3
13
14
15
16
11
G
W
O
R
C
Y1
Y2
LO
OnSW1
1 2 3 4
5 6 7
8 9
10
11 12
ECM2
Air Flow Settings
Black
Blue
14
13
6
7
CC
NO NC
CR4 COM
NO NC
CR3 COM
RV
CCHI
Not Used
Not Used
OnSW3OnSW2
1
2 3 4
5 6
7 8
No Htg3 / Htg3
Dehum / Norm
Fan / CompLoop / WellTest / Norm
Outputs / NormInputs / Norm
2 Speed / 1 Speed
Normal / Finish on 2nd (Note 2)No RPM / RPMElectric Heat / NormalEnvision / E Series or Premier
1
2 3 4
5
Pulse L / Constant L (NOTE 4)
Field Selection Dips - #1 On , #6 On , #7 On Drain pan overflow Lockout FD thermistor (loop<15°F, well<30°F) Lockout
High Pressure Low Pressure / Comfort Alert ECM2 RPM < 100 rpm Lockout
Microprocessor malfunction* HWL thermistor > 130°F DHW pump switch off
Drain Water Flow
High Press Low Press / CAAir Flow
Status DHW Limit DHW off
LED Normal Display Mode
#1 Off, #6 On, #7 On Drain pan overflow FD thermistor (loop<15°F, well<30°F)
High PressureLow Pressure / Comfort Alert ECM2 RPM < 100 rpm
Not Used HWL thermistor > 130°F DHW pump switch off
Current Fault Status
#6 Off, #7 On Y1 Y2
O G W
SL1 SL2--
Inputs
#6 On, #7 Off Compressor Lo Compressor Hi
RV FAN
DHW Pump
Loop Pump 1 Loop Pump 2
--
Outputs
#6 Off, #7 Off Blower Lo
Blower Med
Blower Hi Aux Heat #1 Aux Heat #2
AuxHeat #3 Aux Heat #4
--
Outputs2
Diagnostic Modes
*Green LED not flashing
Notes:1 - 24V Accessory relay (see SW2-3 for description of operation)2 - This Switch allows the unit to down stage with the t-stat when OFF and finish on second stage when ON. Finish second stage reduces stage changing in recip dual capacity compressors and should be ON for unzoned Dual Cap E-Series or Premier 2 speed units. 3 - Comfort Alert fault output to Premier Control Board 4 - SW2-8 must be in the OFF position for pulsed “L” lockout signal and in the ON position for constant “L” lockout signal. 5 - DHW pump only in models with hot water generation option.6 - Connection of remote unit that does not have a loop pump for slave operation.
Thermistor
Light emitting diode - Green
Relay coil
Capacitor w/ bleed resistor
Switch - Condensate overflow
Switch - High pressure
Switch - Low pressure
Switch -Hot Water On/Off
Polarized connector
Factory Low voltage wiringFactory Line voltage wiringField low voltage wiringField line voltage wiringOptional blockDC Voltage PCB tracesInternal junctionQuick connect terminal
Wire nut
Field wire lug
Ground
Fuse
CC -CO -CR 1 -CR 2-CR 3 -CR 4 -
F1 and F2 -
FD -
HE -HP -
LP -PB1, PB2 -PS -RV -SW1 -SW2 -SW3 -SW4 -TS -
Compressor ContactorCondensate overflow sensorDHW pump relayLoop pump relay
Fuses
Freeze Detection Sensor
Heater elementHigh pressure switch
Low pressure switchPower blocksPower stripReversing Valve coilDIP package 12 positionDIP package 8 positionDIP package 5 positionHot water pump enable switchThermal limit switch
Legend
Relay Contacts -N.O., N.C.
G
T
132P
L1
PSC Fan Speed RelayPSC Fan Power Relay
ER 1 to ER4 - Aux heat stage relays
HWL - Hot water limit sensorSC - Start Contactor
Start RelaySR -
CS - Compressor Solenoid **DC Coil**
CA - Comfort Alert
Y1
Y2
O
R
C
L
C
R
Fossil Fuel Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Signal
Reversing Valve
2 nd Stage Compressor
1st Stage CompressorY1
Y2
O
R
C
LO
EZ Split
GGFan
W
W
Auxiliary Heat Relay
Duel Fuel Wiring DiagramUsing Field Installed Relay
Note : Field installed DPST dual fuel relay ( Required for dual fuel installation )
Auxiliary Heat Relay
P2
P1
Shut
Auxiliary Heat Relay
Down
= chassis
LED Flash Code DescriptionGreen Solid Module Has PowerRed Solid Y1 Present But Compressor Not Running
Code 1 Long Run TimeCode 2 System Pressure TripCode 3 Short CyclingCode 4 Locked RotorCode 5 Open CircuitCode 6 Open Start CircuitCode 7 Open Run CircuitCode 8 Welded ContactorCode 9 Low Voltage
Yellow
Comfort Alert Status
NO
T U
SE
D
NOTE 5
DHW Pump
Blu
3AFuse Pink
Blu(17)
Ext Pump 1/2 hp Total 208-230/60/1
Pump Pump
G
2
1
PB1
1
2
Yel(8)
Pink(13)
Unit Power 208-230/60/1
GL2 L1
CC
CS
R
RunCapacitor
Red BlackBlue
Tan(16)
Comfort Alert
CC
Blk(1 )
Violet(2)
Comfort Alert
R
Y
C
Violet(3)
Blk(5)Yel(6)
L Comfort Alert
NOTE 3
Brn(15)Org(14)
Gry(9)
C
NOTE 6
SL1 In
SL1 Out
Optional
Remote Unit Without
Loop Pump
18
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
StartupThe unit will not operate until all the inputs and safety
controls are checked for normal conditions. At first power-
up, a four-minute delay is employed before the compressor
is energized.
Component Sequencing DelaysComponents are sequenced and delayed for optimum
space conditioning performance.
Accessory Relay An accessory relay on the control board allows for field
connection of solenoid valves, electronic air cleaners, etc.
The accessory relay has a normally open output and a
normally closed output.
Short Cycle Protection The control employs a minimum "off" time of four minutes
to provide for short cycle protection of the compressor.
Shutdown ModeA 24VAC common signal to the “shutdown” input on
the control board puts the unit into shutdown mode.
Compressor, hot water pump and blower operation are
suspended.
Safety ControlsThe Envision control receives separate signals for a high
pressure switch for safety, a low pressure switch to prevent
loss of charge damage, and a low suction temperature
thermistor for freeze detection. Upon a continuous
30-second measurement of the fault (immediate for
high pressure), compressor operation is suspended, the
appropriate lockout LED begins flashing. (Refer to the
"Fault Retry" section below.)
TestingThe Envision control allows service personnel to shorten
most timing delays for faster diagnostics. (Refer to the
Field Selection DIP switch SW2-1.)
Fault RetryAll faults are retried twice before finally locking the unit
out. An output signal is made available for a fault LED at
the thermostat. The “fault retry” feature is designed to
prevent nuisance service calls.
DiagnosticsThe Envision control board allows all inputs and outputs to
be displayed on the LEDs for fast and simple control board
diagnosis. (Refer to the Field Selection DIP Switch SW2-1.)
Hot Water High Limit (Domestic Hot Water Option)This mode occurs when the hot water input temperature
is at or above 130°F for 30 continuous seconds. The DHW
limit status LED on the unit illuminates and the hot water
pump de-energizes. Hot water pump operations resume on
the next compressor cycle or after 15 minutes of continuous
compressor operation during the current thermostat
demand cycle.
Hot Water JustificationSince compressor hot gas temperature is dependant on
loop temperature in cooling mode, loop temperatures may
be too low to allow proper heating of water. The control will
monitor water and refrigerant temperatures to determine if
conditions are satisfactory for heating water. The DHW limit
status LED on the unit illuminates when conditions are not
favorable for heating water.
Heating OperationHeat, 1st Stage (Y1)The blower motor is started immediately, the loop pump
is energized 5 seconds after the “Y1” input is received, and
the compressor is energized on low capacity 10 seconds
after the “Y1” input. The hot water pump is cycled 30
seconds after the “Y1” input.
Heat, 2nd Stage (Y1,Y2) Single-Speed Units
The hot water pump is de-energized, which directs all heat
to satisfying the thermostat, and the blower changes to
high speed 15 seconds after the “Y2” input (ECM only).
Heat, 2nd Stage (Y1,Y2) Dual Capacity Units
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first
stage compressor run time of 1 minute has expired. The
ECM blower changes from medium to high speed 15
seconds after the “Y2” input.
The Comfort Alert will delay the second stage compressor
until 5 seconds after it receives a “Y2” from the board.
Microprocessor Control
19
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Microprocessor Control cont.Heat, 3rd Stage (Y1,Y2,W) Single-Speed Units
The first stage of resistance heat is energized 10 seconds
after “W” input, and with continuous 3rd stage demand,
the additional stages of resistance heat engage 90 seconds
after the first stage.
Heat, 3rd Stage (Y1,Y2,W) Dual Capacity Units
The hot water pump is de-energized which directs all heat
to satisfy the thermostat. The 1st stage of resistance heat is
energized 10 seconds after “W” input, and with continuous
3rd stage demand, the additional stages of resistance heat
engage 90 seconds after the first stage.
Emergency Heat (W only)
The blower is started on high speed, and the first stage of
resistance heat is energized 10 seconds after the "W" input.
Continuing demand will engage the additional stages of
resistance heat 90 seconds after the first stage.
Cooling OperationIn all cooling operations, the reversing valve directly
tracks the “O” input. Thus, anytime the “O” input is present,
the reversing valve will be energized.
Cool, 1st Stage (Y1,O)
The blower motor and hot water pump are started
immediately, the loop pump(s) is energized 5 seconds after
the “Y1” input is received. The compressor will be energized
(on low capacity for Dual Capacity units) 10 seconds after
the “Y1” input. The ECM blower will operate at 85% of
medium speed if in dehumidification mode.
Cool, 2nd Stage (Y1, Y2, O) Single Speed Units
The blower changes to high speed (85% of high speed if
in dehumidification mode) 15 seconds after the “Y2” input
(ECM only).
Cool, 2nd Stage (Y1, Y2, O) Dual Capacity Units
The second stage compressor will be activated 5 seconds
after receiving a “Y2” input as long as the minimum first
stage compressor run time of 1 minute has expired. The
ECM blower changes to high speed 15 seconds after the
“Y2” input (85% of high speed if in dehumidification mode).
The Comfort Alert will delay the second stage compressor
until 5 seconds after it receives a “Y2” from the board.
Blower (G only)The blower starts and operates on low speed.
Lockout ConditionsDuring lockout mode, the appropriate unit and thermostat
lockout LEDs will illuminate. The compressor, loop pump,
hot water pump, and accessory outputs are de-energized.
The blower will continue to run on low speed. If the
thermostat calls for heating, emergency heat operation will
occur.
Comfort Alert lockouts cannot be reset at the thermostat.
All other lockout modes can be reset at the thermostat
after turning the unit off, then on, which restores normal
operation but keeps the unit lockout LED illuminated.
Interruption of power to the unit will reset a lockout
without a waiting period and clear all lockout LEDs.
High Pressure
This lockout mode occurs when the normally closed safety
switch is opened momentarily (set at 600 PSI).
Low Pressure
This lockout mode occurs when the normally closed low
pressure switch is opened for 30 continuous seconds (set
at 40 PSI). A low pressure fault may also be indicated when
a Comfort Alert lockout has occurred.
Freeze Detection (Water Flow)This lockout mode occurs when the freeze detection
thermistor temperature is at or below the selected point
(well 30°F or loop 15°F) for 30 continuous seconds.
IntelliStartSome models shall be equipped with an optional
IntelliStart. IntelliStart is a single phase soft starter which
reduces the normal start current (LRA) by 60-70%. This
allows the heat pump to more easily go “off grid.” Using
IntelliStart will also provide a substantial reduction in light
flicker, reduce start-up noise, and improve the compressor’s
start behavior. The IntelliStart is self-calibrating and may
take several starts to optimize the compressor’s starting
characteristics.
Features:Automatic adjustment of the compressor starting •
current to the available supply voltage —maintaining
constant starting torque and current.
Supply line impedance monitoring and compensation.•
Automatic compensation for residual backpressure in •
the system.
Monitoring of supply voltage while compressor is •
running to prevent motor stalling, causing excessive
currents, under low voltage conditions.
Light flicker reductions of up to 10:1 over LRA under •
the same conditions.
20
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Green "POWER" LED - module has powerRed "TRIP" LED - Thermostat "Y" demand signal is present, but the compressor is not running.
Yellow "ALERT" LED LED Description CauseFlash Code 1 Long Run Time Not applicable Flash Code 2 System Pressure Trip Not applicableFlash Code 3 Short Cycling Compressor run time of less than 3 minutes on 4 consecutive cyclesFlash Code 4 Locked Rotor Four consecutive compressor protector trips indicating compressor won't startFlash Code 5 Open Circuit "Y" thermostat demand signal with no compressor currentFlash Code 6 Open Start Circuit "Y" thermostat demand signal with no current in the start circuitFlash Code 7 Open Run Circuit "Y" thermostat demand signal with no current in the run circuitFlash Code 8 Welded Contactor Current detected with no "Y" thermostat demand signal presentFlash Code 9 Low Voltage Less than 17 VAC detected in control circuit
* Flash code number corresponds to a number of LED flashes, followed by a pause and then repeated.
* TRIP and ALERT LEDs flashing at the same time indicates control circuit voltage is too low for operation.
* Reset ALERT flash code by removing 24 VAC power from module.
* Last ALERT flash code is displayed for 1 minute after module is powered on.
Resetting Comfort Alert CodesAlert codes can be reset manually by cycling power off and on to the Comfort Alert module. Alert codes will reset automatically ifconditions return to normal.
Flash Code Number LED Description Automatic Reset of Alert CodesFlash Code 1 Long Run Time Not applicableFlash Code 2 System Pressure Trip Not applicableFlash Code 3 Short Cycling Four "alert free" on and off cycles to reset automaticallyFlash Code 4 Locked Rotor Four "alert free" on and off cycles to reset automaticallyFlash Code 5 Open Circuit One "alert free" on and off cycles to reset automaticallyFlash Code 6 Open Start Circuit One "alert free" on and off cycles to reset automaticallyFlash Code 7 Open Run Circuit One "alert free" on and off cycles to reset automaticallyFlash Code 8 Welded Contactor One "alert free" on and off cycles to reset automaticallyFlash Code 9 Low Voltage Resets when voltage rises above 19 VAC
* Reset ALERT flash code by removing 24 VAC power from module.
Comfort Alert Flash Codes
Microprocessor Control cont.
Compressor Monitoring/Comfort AlertThe Comfort Alert displays abnormal compressor condi-
tions through a unique flash code and communicates the
conditions to the heat pump microprocessor control. The
heat pump microprocessor will determine which fault to act
on and ignore. Fault codes 2 (system pressure), 4 (locked
rotor), 6 (open start circuit), and 7 (open run circuit) will re-
sult in a lockout. All other fault codes are passive. All com-
pressor alerts are displayed on the module by flashing the
yellow Alert LED a specific number of times consecutively
followed by a pause, and then repeated. The number of
consecutive flashes or “Flash Code” correlates to a specific
abnormal condition. The red “TRIP” LED means there is a
thermostat demand signal “Y” present but the compressor
is not running. The green “POWER” LED means the module
has power.
21
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
The following tables show the codes that will be displayed on the different ComforTalk and FaultFlash thermostats.
FaultFlash Thermostats ComforTalk Thermostats
Thermostat DisplayLockout Code
Thermostat DisplayLockout Code
Lockout Description Lockout Description
2 Flashes High Pressure Fault "High Pressure" or "E2" High Pressure Fault3 Flashes Low Pressure Fault "Low Pressure" or "E3" Low Pressure Fault4 Flashes Not Applicable "E4" Not Applicable5 Flashes Water Flow Fault "Water Flow" or "E5" Water Flow Fault6 Flashes Not Applicable "E6" Not Applicable7 Flashes Condensate Fault "Condensate" or "E7" Condensate Fault8 Flashes Voltage out of Range "Voltage Range" or "E8" Voltage out of Range9 Flashes RPM Fault "RPM" or "E9" RPM Fault
10 Flashes Comfort Alert CompressorModule Fault
"Comfort Alert" or "E10" Comfort Alert CompressorModule Fault
Lockout code 10 - see Comfort Alert module to determine the specific flash code forcompressor abnormalities.
These thermostats can be configured to display the lockout condition "text" or error number.* A slow flash of 1 second on and off means the heat pump microprocessor SW2-1 is configured for "Test Mode" or thermostat is miswired.
Lockout code 10 - see Comfort Alert module to determine the specific flash code for compressor abnormalities.
TA32W01 and TP32W02 Thermostats TP32U03, TP32U04 and TP32U05 Thermostats
Thermostat DisplaysFault Flash
When using a TA32W01 or TP32W02 thermostat and SW2-
8 is in the pulsing “L” position, FaultFlash will enable a user
to view the thermostat and count the fault indicator flashes
to determine the lockout condition the unit is experiencing.
ComforTalk
When using a TP32U03, 04 or 05 thermostat and SW2-8
is in the pulsing “L” position, ComforTalk will enable the
user to view the thermostat and determine the fault. The
Microprocessor Control cont.thermostat can be configured to show either lockout text
or lockout codes.
The LED board on the front of the unit will display all
lockouts. The Low Pressure LED will flash for a low pres-
sure condition or a Comfort Alert fault. If the low pressure
lockout was caused by Comfort Alert codes 4, 6 or 7, then
the Comfort Alert will be flashing. If no Comfort Alert code
is visible, then it is a low pressure lockout.
22
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
OPERATION LOGIC HEATING COOLING
FAN ONSL1 - IN
ONSL2 - IN
ONSTG1 STG2 STG3 EMERG STG1 STG2
SINGLE SPEED UNITS
Compressor On On On Off On On - - -
Rev Valve Off Off Off Off On On - - -
Loop Pump On On On Off On On - On -
DHW Pump On Off Off Off On On - - -
Secondary 1- Out On On On Off On On - - -
Emerg LED Off Off Off On Off Off Off - -
T-Stat Signal Y1 Y1, Y2 Y1, Y2, W W Y1, O Y1, Y2, O G - -
DUAL CAPACITY UNITS
Compressor-Lo On Off Off Off On Off - - -
Compressor-Hi Off On On Off Off On - - -
Rev Valve Off Off Off Off On On - - -
Loop Pump On On On Off On On - On -
DHW Pump On On Off Off On On - - -
Secondary 1- Out On On On Off On On - - -
Secondary 2- Out Off On On Off Off On - - -
Emerg LED Off Off Off On Off Off - - -
T-Stat Signal Y1 Y1, Y2 Y1, Y2, W W Y1, O Y1, Y2, O G - -
Operation Logic Data
DIP SWITCH NUMBER
DESCRIPTION OFF POSITION ON POSITION
SW1 N/A NOT USED N/A N/A
SW2
1
Service/Test Mode - Allows control of “NORM” or “TEST” operational modes. Test mode accelerates most timing functions 16 times to allow faster troubleshooting. Test mode also allows viewing the “CURRENT” status of the fault inputs on the LED display.
Test Norm
2Freeze Detection Temperature Limit (Water Flow)This lockout mode occurs when the freeze detection thermistor temperature is at or below the selected point (well 30°F or loop 15°F) for 30 continuous seconds.
Loop (Protection 15° F)
Well (Protection 30° F)
3
Accessory Relay
Allows field selection of the accessory relay to operate with the compressor or fan.
Fan Comp
4 NOT USED N/A N/A
5 NOT USED N/A N/A
6Input Diagnostics - Allows viewing the inputs from the thermostat to the control board such as Y1, Y2, O, G, W, SL1-In on the LED display.
Diagnostic Inputs viewed at LEDs
Normal Display viewed at LEDs
7Output Diagnostics - Allows viewing the outputs from the control board such as the compressor, reversing valve, blower, hot water pump, and loop pump on the LED display.
DiagnosticOutputs viewed at
LEDs
Normal Display viewed
at LEDs
8Thermostat Selection Configures the control for a pulsed lockout signal (ComforTalk and FaultFlash thermostats) or continuous 5 VAC lockout signal.
Pulsed “L” signal
Continuous “L” signal
SW3
1 Single or Dual Capacity Operation Dual Cap 1 Speed
2
Zoned/Finish on Second Stage
This switch allows the unit to down stage with the thermostat when off and finish with second stage when on. Finish on second stage reduces stage changing in reciprocating dual capacity compressors.
Normal - All other systems
Finish on 2nd Unzoned Dual
Capacity E-Series or
Premier 2 speed
3 ECM Fan Monitoring - Set for No PRM on split systems No RPM RPM
4 NOT USED N/A N/A
5On dual capacity units this switch allows stage change: on the fly when off, and 1 minute delay when on. A delay is required on all reciprocating dual capacity units.
Envision E-Series or Premier
DIP Switch Settings
23
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
The Envision series comes with a holding charge. The
charge must be adjusted in the field based on performance.
Refrigeration piping on the split consists of installing a
brazed copper line set between the blower coil unit and the
unit’s split compressor section. To select the proper tube
diameters for the installation, refer to the Line Set Sizes
table. Line sets over 60 feet long are not recommended
because of oil return and pressure drop problems. The
suction line must always be insulated. Handle and route the
line sets carefully to avoid kinking or bending the tubes. If
the line set is kinked or distorted and it cannot be formed
back into its original shape, the bad portion of the pipe
should be replaced. A restricted line set will affect the
performance of the system.
Fasten the copper line set to the blower coil unit as
instructed by the coil installation instructions shown in
Refrigeration
Replace caps afteropening system
Service ports forattaching refrigerant
gaugesInsulated
Suction Line
BrazeConnection
LiquidLine
ccw
ccw
Figure 13: Typical Split System Refrigerant Line Connections
Position Description SystemService
Port
CW - Full In Shipping Position Closed Open
CCW - Full Out 1/2 turn CW Service Position Open Open
CCW - Full Out Operation Position Open Closed
TXV ("IN" toward condensing unit)
Equalizer Bulb
Suction
Liquid
TXV has internal check valve
Figure 14: Attaching the Air Coil
Figure 14. Nitrogen should be bled through the system at 2
to 3 PSI to prevent oxidation inside the refrigerant tubing.
Use a low silver phos-copper braze alloy on all brazed
connections.
Braze line set to the service valve stubs on the outside
front of the split cabinet as shown in Figure 13. Nitrogen
should be bled through the system at 2 to 3 PSI to prevent
oxidation contamination. Use a low silver phos-copper
braze alloy on all brazed connections. Envision split units
are shipped with a factory charge and service valves are not
to be opened until the line set has been leak tested, purged
and evacuated. Schrader cores should be removed before
brazing. A heat sink should be used on the service valves
and TXV to prevent damage caused by excessive heat.
24
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Leak Testing
The refrigeration line set must be pressurized and
checked for leaks before purging and charging the unit.
To pressurize the line set, attach refrigerant gauges to the
service ports and add an inert gas (nitrogen or dry carbon
dioxide) until pressure reaches 60 to 90 PSIG. Never use
oxygen or acetylene to pressure test. Use an electronic leak
detector or a good quality bubble solution to detect leaks
on all connections made in the field. Check the service
valve ports and stem for leaks and all connections made in
the field. If a leak is found, repair it and repeat the above
steps. For safety reasons do not pressurize the system
above 150 psi. Purge pressure from line set. The system is
now ready for evacuating and charging.
System Evacuation
Ensure that the line set and air coil are evacuated before
opening service valves to the split unit. The line set must be
evacuated to at least 200 microns to remove the moisture
and air that may still be in the line set and coil. Evacuate
the system through both service ports to prevent false
readings on the gauge because of pressure drop through
service ports.
Charge Amount When Using NAH Air Handler
The Envision Split is shipped with a factory pre-charge. This
volume of refrigerant is not sufficient to run the system and
additional refrigerant must be added. If using an NAH Air
Handler please refer to the Line Set Sizes table for charge
amounts to be added. The “Factory Charge” column is the
charge amount the compressor section/split is shipped
with from the factory. The “Charge Amount with NAH Air
Handler” column is the total amount of charge for the NAH
Air Handler + Compressor section/split. This column does
not factor in additional refrigerant needed for the line set.
The installer of the system must add charge appropriately
for the specific length of the line set. A 3/8 in. liquid line is
calculated at 0.50 oz. of charge per linear foot, and a 1/2
in. liquid line is calculated at 1.0 oz. of charge per linear
foot using R-410A refrigerant. The suction line will not hold
“liquid” and should be ignored for the charge calculation.
Example: NSZ036/NAH036 with 20 ft. of 3/8 in. liquid
line. Remember that when using the NAH Air
Handler, the column “Charge Amount with NAH
Air Handler” will be used. Now calculate for the
additional 20 ft. line set.
Additional refrigerant to be added = (20 ft. x 0.5 oz.)
= 10 oz.
Solution: 10 oz. should be added to the recommended
charge of 86 oz. found in the “Charge Amount
with NAH Air Handler” column for a total charge
of 96 oz.
Refrigeration cont.After initial charge, the system should be operated and
the system subcooling and superheat verified to the Unit
Operating Parameters table.
If an air handler manufactured by others is used then
refrigerant should be added to the Envision Split factory
pre-charge. Refrigerant should be added for liquid line
length. This should result in a slightly under-charged
system exhibiting low subcooling and high superheat.
As charge is added, the subcooling should rise and the
superheat should fall.
Charging the System
Charge Method – After purging and evacuating the line set,
fully open the service valves counterclockwise. Add R-410A
(liquid) into the liquid line service port until the pressure
in the system reaches approximately 200 PSIG. Never add
liquid refrigerant into the suction side of a compressor.
Start the unit and measure superheat and subcooling. Keep
adding refrigerant until the unit meets the superheat and
subcooling values on the Operating Parameters tables.
Checking Superheat and SubcoolingDetermining Superheat
Measure the temperature of the suction line at the 1.
point where the expansion valve bulb is clamped.
Determine the suction pressure in the suction line 2.
by attaching refrigeration gauges to the Schrader
connection on the suction side of the compressor.
Convert the pressure obtained in Step 2 to the 3.
saturation temperature by using the R-410A Pressure/
Temperature Conversion Chart.
Subtract the temperature obtained in Step 3 from 4.
Step 1. The difference is the amount of superheat for
the unit. Refer to the Operating Parameters tables for
superheat ranges at specific entering water conditions.
Superheat Adjustment
TXVs are factory set to a specific superheat; however, the
superheat should be adjusted for the application. To adjust
the TXV to other superheat settings:
Remove the seal cap from the bottom of the valve. 1.
Turn the adjustment screw clockwise to increase 2.
superheat and counterclockwise to decrease
superheat. One complete 360° turn changes the
superheat approximately 3-4°F, regardless of
refrigerant type. You may need to allow as much as 30
minutes after the adjustment is made for the system to
stabilize.
Once the proper superheat setting has been achieved, 3.
replace and tighten the seal cap.
25
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
WARNING: There are 8 total (360°) turns on the superheat adjustment stem from wide open to fully closed. When adjusting the superheat stem clockwise (superheat increase) and the stop is reached, any further clockwise turning adjustment will damage the valve.
Determining Subcooling
Measure the temperature of the liquid line on the 1.
small refrigerant line (liquid line) just outside the
split cabinet. This location will be adequate for
measurement in both modes unless a significant
temperature drop in the liquid line is anticipated.
Measure the liquid line pressure by attaching 2.
refrigerant gauges to the Schrader connection on the
liquid line service valve.
Convert the pressure obtained in Step 2 to the 3.
saturation temperature by using the R-410A Pressure/
Temperature Conversion Chart.
Subtract the temperature in Step 1 from the 4.
temperature in Step 3. The difference will be the
subcooling value for that unit. Refer to the Operating
Parameters tables for subcooling ranges at specific
enter water conditions.
Refrigeration cont.
Line Set Sizes
NOTES: * The "Charge Amount with NAH Air Handler" column is based on the charge amount for a NAH Air Handler+Compressor Section/Split. Additional charge will have to be added accordingly for line set length. After Charge is added adjustments can be made to get appropriate subcooling and superheat. Additional charge for R-410A is 0.50 oz. per ft. for 3/8 in. and 1.0 oz. per ft. for 1/2 in. tube. Longer line sets will significantly reduce capacity and efficiency of the system as well as adversely effect the system reliability due to poor oil return.
UnitSize
Air Handler
20 feet 40 feet 60 feet FactoryCharge
(oz.)
*Charge Amount with NAH Air Handler (oz.)Suction Liquid Suction Liquid Suction Liquid
022 NAH022 5/8” OD 3/8” OD 5/8” OD 3/8” OD 3/4” OD 3/8” OD 56 78
030 NAH030 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 3/8” OD 56 78
036 NAH036 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 56 86
042 NAH042 3/4” OD 3/8” OD 3/4” OD 3/8” OD 7/8” OD 1/2” OD 74 99
048 NAH048 3/4” OD 3/8” OD 7/8” OD 3/8” OD 7/8” OD 1/2” OD 90 115
060 NAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 92 112
070 NAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 108 132
026 NAH026 5/8” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 52 74
038 NAH036 3/4” OD 3/8” OD 3/4” OD 3/8” OD 3/4” OD 1/2” OD 56 86
049 NAH048 3/4” OD 3/8” OD 7/8” OD 3/8” OD 7/8” OD 1/2” OD 90 115
064 NAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 92 112
072 NAH060 7/8” OD 1/2” OD 7/8” OD 1/2” OD 1-1/8” OD 1/2” OD 104 132
4/6/10
26
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Pressure/Temperature Conversion Chart for R-410A
PRESSURE (PSIG)
TEMP °F
PRESSURE (PSIG)
TEMP °F
PRESSURE (PSIG)
TEMP °F
PRESSURE (PSIG)
TEMP °F
PRESSURE (PSIG)
TEMP °F
60 8.5 180 63.5 300 96.3 420 120.6 540 140.062 9.9 182 64.2 302 96.8 422 120.9 542 140.364 11.2 184 64.8 304 97.2 424 121.3 544 140.666 12.5 186 65.5 306 97.7 426 121.6 546 140.968 13.8 188 66.1 308 98.1 428 122.0 548 141.270 15.1 190 66.8 310 98.6 430 122.3 550 141.472 16.3 192 67.4 312 99.0 432 122.7 552 141.774 17.5 194 68.0 314 99.5 434 123.0 554 142.076 18.7 196 68.7 316 99.9 436 123.4 556 142.378 19.8 198 69.3 318 100.4 438 123.7 558 142.680 21.0 200 69.9 320 100.8 440 124.1 560 142.982 22.1 202 70.5 322 101.2 442 124.4 562 143.284 23.2 204 71.1 324 101.7 444 124.8 564 143.586 24.3 206 71.7 326 102.1 446 125.1 566 143.788 25.4 208 72.3 328 102.5 448 125.4 568 144.090 26.5 210 72.9 330 103.0 450 125.8 570 144.392 27.5 212 73.5 332 103.4 452 126.1 572 144.694 28.6 214 74.1 334 103.8 454 126.5 574 144.996 29.6 216 74.7 336 104.2 456 126.8 576 145.198 30.6 218 75.3 338 104.7 458 127.1 578 145.4100 31.6 220 75.8 340 105.1 460 127.5 580 145.7102 32.6 222 76.4 342 105.5 462 127.8 582 146.0104 33.5 224 77.0 344 105.9 464 128.1 584 146.2106 34.5 226 77.5 346 106.3 466 128.5 586 146.5108 35.4 228 78.1 348 106.7 468 128.8 588 146.8110 36.4 230 78.7 350 107.2 470 129.1 590 147.1112 37.3 232 79.2 352 107.6 472 129.4 592 147.3114 38.2 234 79.8 354 108.0 474 129.8 594 147.6116 39.1 236 80.3 356 108.4 476 130.1 596 147.9118 40.0 238 80.9 358 108.8 478 130.4 598 148.2120 40.9 240 81.4 360 109.2 480 130.7 600 148.4122 41.7 242 81.9 362 109.6 482 131.1 602 148.7124 42.6 244 82.5 364 110.0 484 131.4 604 149.0126 43.4 246 83.0 366 110.4 486 131.7 606 149.2128 44.3 248 83.5 368 110.8 488 132.0 608 149.5130 45.1 250 84.1 370 111.2 490 132.3132 45.9 252 84.6 372 111.6 492 132.7134 46.7 254 85.1 374 112.0 494 133.0136 47.5 256 85.6 376 112.3 496 133.3138 48.3 258 86.1 378 112.7 498 133.6140 49.1 260 86.6 380 113.1 500 133.9142 49.9 262 87.1 382 113.5 502 134.2144 50.7 264 87.7 384 113.9 504 134.5146 51.5 266 88.2 386 114.3 506 134.9148 52.2 268 88.7 388 114.7 508 135.2150 53.0 270 89.2 390 115.0 510 135.5152 53.7 272 89.6 392 115.4 512 135.8154 54.5 274 90.1 394 115.8 514 136.1156 55.2 276 90.6 396 116.2 516 136.4158 55.9 278 91.1 398 116.5 518 136.7160 56.6 280 91.6 400 116.9 520 137.0162 57.4 282 92.1 402 117.3 522 137.3164 58.1 284 92.6 404 117.6 524 137.6166 58.8 286 93.0 406 118.0 526 137.9168 59.5 288 93.5 408 118.4 528 138.2170 60.2 290 94.0 410 118.7 530 138.5172 60.8 292 94.5 412 119.1 532 138.8174 61.5 294 94.9 414 119.5 534 139.1176 62.2 296 95.4 416 119.8 536 139.4178 62.9 298 95.8 418 120.2 538 139.7
27
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Cooling -- No Hot Water Generator
Entering Water Temp
°F
Water Flow
GPM/Ton
NSZ022 thru NSZ060 NSZ070 NSZ022 thru NSZ070
SuctionPressure PSIG
DischargePressure PSIG
SuctionPressure PSIG
DischargePressure PSIG
Superheat SubcoolingWater Temp
Rise °FAir Temp Drop
°F DB
501.5 115-150 205-245 115-130 205-245 12-22 7-14 5-22 18-24
3.0 110-145 200-235 110-125 200-235 14-26 6-12 8-12 18-24
701.5 125-160 260-300 125-160 275-300 8-14 8-12 5-19 18-22
3.0 115-150 265-295 115-135 265-295 9-16 4-16 5-12 18-22
901.5 125-160 320-370 125-160 330-370 8-14 6-13 14-22 18-22
3.0 120-150 305-355 120-150 325-365 9-16 4-16 5-12 18-22
Heating -- No Hot Water Generator
Entering Water Temp
°F
Water Flow
GPM/Ton
NSZ022 thru NSZ060 NSZ070 NSZ022 thru NSZ070
SuctionPressure PSIG
DischargePressure PSIG
SuctionPressure PSIG
DischargePressure PSIG
Superheat SubcoolingWater Temp
Drop °FAir Temp Rise
°F DB
301.5 65-85 290-310 65-85 330-360 7-13 2-21 7-10 18-24
3.0 70-90 265-330 70-90 335-365 6-12 2-21 3-7 22-26
501.5 95-120 320-345 95-120 395-430 6-12 2-21 5-11 21-34
3.0 100-125 280-365 100-125 375-405 6-12 4-22 5-11 24-33
701.5 135-155 315-380 135-155 435-485 8-14 10-20 8-14 26-46
3.0 135-156 315-395 135-155 440-490 8-14 10-20 3-10 25-48
Operating Parameters
Single Speed Models - NSZ022 thru NSZ070(with NAH Series Air Handler)
NOTES: Cooling performance based on entering air temperatures of 80°F DB, 67°F WB. Heating performance based on entering air temperatures of 70°DB.
5/29/08
Thermistor ResistanceThermistor Temperature (°F) Resistance in Ohms
78.5 9230 -10007
77.5 9460 - 10032
76.5 9690 - 10580
75.5 9930 - 10840
33.5 30490 - 32080
32.5 31370 - 33010
31.5 32270 - 33690
30.5 33190 - 34940
1.5 79110 - 83750
0.5 81860 - 86460
0.0 82960 - 87860
28
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Operating Parameters cont.
NDZ026 thru NDZ072 (with NAH Series Air Handler)First Stage Operation
Cooling -- No Hot Water Generator
Entering Water Temp
°F
Water Flow GPM/Ton
NDZ026 thru NDZ064 NDZ072 NDZ026 thru NDZ072
SuctionPressure
PSIG
DischargePressure
PSIG
SuctionPressure
PSIG
DischargePressure
PSIGSuperheat Subcooling
Water Temp Rise °F
Air Temp Drop °F DB
501.5 130-150 193-230 130-150 200-245 8-16 7-14 7-20 18-24
3.0 128-153 190-230 125-140 205-240 8-16 3-10 9-14 18-25
701.5 130-150 238-282 135-150 240-280 6-16 4-16 9-18 18-25
3.0 130-155 238-262 125-145 245-270 6-18 5-11 5-10 18-24
901.5 133-148 308-340 130-155 300-365 7-16 6-18 4-11 19-25
3.0 138-153 303-333 130-165 305-350 7-18 7-14 5-9 17-22
Heating -- No Hot Water Generator
Entering Water Temp
°F
Water Flow GPM/Ton
NDZ026 thru NDZ064 NDZ072 NDZ026 thru NDZ072
SuctionPressure
PSIG
DischargePressure
PSIG
SuctionPressure
PSIG
DischargePressure
PSIGSuperheat Subcooling
Water Temp Drop °F
Air Temp Rise °F DB
301.5 78-100 275-325 85-105 325-385 6-11 4-16 2-8 20-29
3.0 78-110 285-325 90-120 335-375 6-11 4-16 3-7 20-32
501.5 105-120 305-350 100-130 340-400 5-12 4-16 5-12 24-32
3.0 110-125 305-355 110-125 345-395 9-15 2-14 4-9 20-34
701.5 140-155 305-355 130-165 370-430 5-12 2-14 8-12 24-39
3.0 145-160 330-360 140-160 375-425 7-17 7-15 4-9 24-39
Second Stage Operation
Cooling -- No Hot Water Generator
Entering Water Temp
°F
Water Flow GPM/Ton
NDZ026 thru NDZ064 NDZ072 NDZ026 thru NDZ072
SuctionPressure
PSIG
DischargePressure
PSIG
SuctionPressure
PSIG
DischargePressure
PSIGSuperheat Subcooling
Water Temp Rise °F
Air Temp Drop °F DB
501.5 120-140 200-245 105-150 210-270 7-17 6-14 7-16 19-26
3.0 115-140 195-290 110-130 215-260 7-15 4-11 8-12 20-24
701.5 121-136 265-310 105-150 280-350 9-15 6-18 7-15 19-25
3.0 123-139 265-310 110-140 285-320 10-16 8-16 8-12 18-24
901.5 122-140 310-360 115-140 325-385 8-14 6-18 10-16 18-24
3.0 123-139 310-350 120-135 330-355 8-14 7-15 8-12 17-23
Heating -- No Hot Water Generator
Entering Water Temp
°F
Water Flow GPM/Ton
NDZ026 thru NDZ064 NDZ072 NDZ026 thru NDZ072
SuctionPressure
PSIG
DischargePressure
PSIG
SuctionPressure
PSIG
DischargePressure
PSIGSuperheat Subcooling
Water Temp Drop °F
Air Temp Rise °F DB
301.5 72-89 295-350 70-100 320-370 7-18 10-20 4-13 18-24
3.0 73-87 305-330 75-90 315-365 7-18 10-20 4-16 18-27
501.5 100-120 320-365 95-130 375-430 6-14 6-18 4-10 23-34
3.0 105-120 355-365 100-125 370-420 6-14 6-18 4-9 20-37
701.5 142-158 360-380 130-165 400-470 6-12 4-15 6-15 28-38
3.0 138-152 365-390 135-160 405-465 7-14 4-15 6-12 24-42
NOTES: Cooling performance based on entering air temperatures of 80°F DB, 67°F WB. Heating performance based on entering air temperatures of 70°DB.
5/29/08
29
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Pressure Drop and Recommended Flow Rates
30°F 50°F 70°F 90°F 110°F
4 1.4 1.3 1.2 1.1 1.0
6 2.8 2.6 2.4 2.3 2.1
8 4.7 4.4 4.1 3.8 3.5
10 7.0 6.6 6.2 5.8 5.3
3 0.8 0.7 0.7 0.7 0.6
5 2.0 1.8 1.7 1.6 1.5
7 3.6 3.4 3.2 3.0 2.8
9 5.8 5.5 5.1 4.8 4.4
5 1.2 1.2 1.1 1.0 1.0
7 2.2 2.1 1.9 1.8 1.7
9 3.4 3.2 3.0 2.8 2.6
11 4.9 4.6 4.3 4 3.7
4 0.9 0.8 0.8 0.7 0.7
6 1.7 1.6 1.5 1.4 1.3
8 2.8 2.6 2.5 2.3 2.1
10 4.2 3.9 3.7 3.4 3.2
6 1.2 1.2 1.1 1.0 1.0
9 2.4 2.2 2.1 2.0 1.8
12 3.9 3.6 3.4 3.2 2.9
15 5.7 5.3 5 4.7 4.3
5 0.9 0.9 0.8 0.8 0.7
8 2.0 1.8 1.7 1.6 1.5
11 3.4 3.1 2.9 2.8 2.5
14 5.0 4.7 4.4 4.1 3.8
8 1.8 1.7 1.6 1.4 1.3
12 3.8 3.5 3.3 3.0 2.8
16 6.5 6.0 5.6 5.2 4.8
20 9.7 9.1 8.5 8.0 7.4
6 1.0 0.9 0.9 0.8 0.8
10 2.6 2.5 2.3 2.1 2.0
14 5.0 4.7 4.4 4.1 3.8
18 8.1 7.6 7.1 6.6 6.1
12 3.2 3.0 2.8 2.6 2.4
15 4.5 4.2 4.0 3.7 3.4
18 6.0 5.7 5.3 4.9 4.6
21 7.8 7.3 6.8 6.4 5.9
10 2.3 2.1 2.0 1.9 1.7
13 3.6 3.3 3.0 2.8 2.6
16 5.0 4.6 4.3 4.0 3.7
19 6.5 6.2 5.8 5.4 5.0
5/30/06
038 full
load
049 part load
064 full
load
072 part load
064 part load
072 full
load
Pressure Drop (psi)Model GPM
026 part load
038 part load
049 full
load
026 full
load
30°F 50°F 70°F 90°F 110°F
3 0.9 0.9 0.8 0.7 0.7
0224.5 1.7 1.6 1.5 1.4 1.3
6 2.8 2.7 2.5 2.3 2.2
8 4.7 4.4 4.1 3.9 3.6
4 1.5 1.4 1.3 1.2 1.1
0306 3.0 2.8 2.7 2.5 2.3
8 5.1 4.8 4.5 4.2 3.9
10 7.7 7.2 6.8 6.3 5.8
5 1.0 1.0 0.9 0.8 0.8
0367 2.1 1.9 1.8 1.7 1.6
9 3.6 3.3 3.0 2.8 2.6
12 6.3 5.9 5.5 5.1 4.8
5 0.8 0.7 0.7 0.7 0.6
0428 2.1 2.1 1.9 1.8 1.7
11 4.2 4.1 3.8 3.5 3.3
14 7.6 6.7 6.3 5.8 5.4
6 1.1 1.0 1.0 0.9 0.8
0489 2.3 2.1 2.0 1.9 1.7
12 3.9 3.7 3.4 3.2 3.0
16 6.7 6.3 5.9 5.5 5.1
9 2.4 2.2 2.1 2.0 1.8
06012 3.9 3.6 3.4 3.2 2.9
15 5.7 5.3 5.0 4.7 4.3
20 9.5 8.9 8.3 7.8 7.2
12 3.0 2.8 2.6 2.4 2.2
07015 4.4 4.0 3.8 3.5 3.3
18 6.0 5.5 5.1 4.8 4.4
24 9.7 9.1 8.5 7.9 7.3
5/30/06
Pressure Drop (psi)Model GPM
Single Speed Dual Capacity
30
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
High voltage is correct and matches nameplate.•
Fuses, breakers and wire size correct.•
Low voltage wiring complete.•
Piping completed and water system cleaned and •
flushed.
Air is purged from closed loop system.•
Isolation valves are open, water control valves or loop •
pumps wired.
Condensate line open and correctly pitched.•
Transformer switched to 208V if applicable.•
DIP switches are set correctly.•
DHW pump switch is “OFF” unless piping is completed •
and air has been purged.
Blower rotates freely.•
Blower speed correct.•
Air filter/cleaner is clean and in position.•
Service/access panels are in place.•
Return air temperature is between 50-80°F heating •
and 60-95°F cooling.
Check air coil cleanliness to insure optimum •
performance. Clean as needed according to
maintenance guidelines. To obtain maximum
performance the air coil should be cleaned before
startup. A 10-percent solution of dishwasher detergent
and water is recommended for both sides of coil, a
thorough water rinse should follow.
Startup StepsNOTES: Complete the Equipment Start-Up/Commissioning
Check Sheet during this procedure. Refer to thermostat
operating instructions and complete the startup procedure.
Initiate a control signal to energize the blower motor. 1.
Check blower operation.
Initiate a control signal to place the unit in the cooling 2.
mode. Cooling setpoint must be set below room
temperature.
First stage cooling will energize after a time delay. 3.
Be sure that the compressor and water control valve or 4.
loop pump(s) are activated.
Verify that the water flow rate is correct by measuring 5.
the pressure drop through the heat exchanger using
the P/T plugs and comparing to unit capacity data in
specification catalog.
Check the temperature of both the supply and 6.
discharge water (see Operating Parameters tables).
Check for an air temperature drop of 15°F to 25°F 7.
across the air coil, depending on the fan speed and
entering water temperature.
Decrease the cooling set point several degrees and 8.
verify high-speed blower operation.
Adjust the cooling setpoint above the room 9.
temperature and verify that the compressor and water
valve or loop pumps deactivate.
Unit StartupBefore Powering Unit, Check The Following: Initiate a control signal to place the unit in the heating 10.
mode. Heating set point must be set above room
temperature.
First stage heating will energize after a time delay. 11.
Check the temperature of both the supply and 12.
discharge water (see Operating Parameters tables).
Check for an air temperature rise of 20°F to 35°F 13.
across the air coil, depending on the fan speed and
entering water temperature.
If auxiliary electric heaters are installed, increase 14.
the heating setpoint until the electric heat banks
are sequenced on. All stages of the auxiliary heater
should be sequenced on when the thermostat is in
the Emergency Heat mode. Check amperage of each
element.
Adjust the heating setpoint below room temperature 15.
and verify that the compressor and water valve or loop
pumps deactivate.
During all testing, check for excessive vibration, noise 16.
or water leaks. Correct or repair as required.
Set system to desired normal operating mode and set 17.
temperature to maintain desired comfort level.
Instruct the owner/operator in the proper operation of 18.
the thermostat and system maintenance.
NOTES: Be certain to fill out and forward all warranty
registration papers.
Final EvaluationAfter the initial check of superheat/subcooling values
in the heating mode, shut off the unit and allow it to sit
3 to 5 minutes until pressures equalize. Restart the unit
in the cooling mode and check the values against those
in the Operating Parameters tables. If the unit performs
satisfactorily, charging is complete. If the unit does not
perform to specifications, the charge may need to be
readjusted until the values are close. Adding refrigerant will
increase subcooling. Recovering some of the refrigerant
will decrease subcooling and increase superheat. If the
superheat/subcooling values are still not close to the
specifications in the Operating Parameters tables, analyze
refrigerant circuit operation.
31
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Heating Cycle Analysis
COOLING TXV - ACTIVERIGHT TO LEFT
ClgTXV
Linesetlength
Measure liquid linetemperature andpressure here inboth heating andcooling modes
COAX
HEATING TXV - ACTIVE LEFT TO RIGHT
HtgTXV
Measure suction temperaturehere at TXV bulb in heating modes.
Suct PSI____Suct sat temp____
Volts ____Amps ____
EWT ____LWT ____
Suct temp____Super heat____
Discharge PSI____Disch. sat temp____Liquid temp____Sub cooling____
Bi-flowfilter/drier
AirCoil
Suction
Discharge
Comp
Hot WaterGenerator
Measure suctiontemperature hereat TXV bulb incooling modes.
Cooling Cycle Analysis
COOLING TXV - ACTIVERIGHT TO LEFT
ClgTXV
Measure liquid linetemperature andpressure here inboth heating andcooling modes
COAX
HEATING TXV-ACTIVE LEFT TO RIGHT
HtgTXV
Measure suction temperaturehere at TXV bulb in heating modes.
Suct PSI ____Suct sat temp ____
Volts ____Amps ____
EWT ____LWT ____
Suct temp ____Super heat ____
Discharge PSI ____Disch. sat temp ____Liquid temp ____Sub cooling ____
Bi-flowfilter/drier
AirCoil
Suction
Discharge
Comp
Measure suctiontemperature hereat TXV bulb incooling modes.
Note: DO NOT hook up pressure gauges unless there appears to be a performance problem.
Linesetlength
Hot WaterGenerator
Unit Startup/Troubleshooting
32
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Standard Microprocessor ControlsTo check the unit control board for proper operation:
Disconnect thermostat wires at the control board.1.
Jumper the desired test input (Y1, Y2, W, O or G) to the 2.
R terminal to simulate a thermostat signal.
If control functions properly:3.
Check for thermostat and field control wiring (use •
the diagnostic inputs mode).
Refrigerant Systems To maintain sealed circuit integrity, do not install service
gauges unless unit operation appears abnormal. Compare
the change in temperature on the air side as well as the
water side to the Operating Parameters tables. If the unit’s
performance is not within the ranges listed, and the airflow
and water flow are known to be correct, gauges should
then be installed and superheat and subcooling numbers
calculated. If superheat and subcooling are outside
recommended ranges, an adjustment to the refrigerant
charge may be necessary.
NOTES: Refrigerant tests must be made with hot water
generator turned “OFF”. Verify that air and water flow rates
are at proper levels before servicing the refrigerant circuit.
LEDNORMAL
DISPLAY MODE
DIAGNOSTIC MODESCURRENT
FAULT STATUSINPUTS OUTPUTS 1 OUTPUTS 2
Field Selection DIPS
SW2- 1 On SW2- 1 Off SW2- 1 NA SW2- 1 NA SW2- 1 NA
SW2- 6 On SW2- 6 On SW2- 6 Off SW2- 6 On SW2- 6 Off
SW2- 7 On SW2- 7 On SW2- 7 On SW2- 7 Off SW2- 7 Off
DrainDrain Pan Overflow
LockoutDrain Pan Overflow Y1
Compressor(On or Low)
Blower Low
Water FlowFD Thermistor (Loop <15° F,
Well<30°F) Lockout
FD Thermistor (Loop <15° F, Well<30°F)
Y2Compressor(On or High)
Blower Medium
High Pressure
High Pressure >600 PSI Lockout
High Pressure >600 O Reversing ValveBlower High
LowPressure,CurrentSensor
Low Pressure <40 Low Pressure <40 G Fan Aux Heat 1
AirflowECM2 RPM <100
RPMECM2 RPM <100
RPMW DHW Pump Aux Heat 2
StatusMicroprocessor
MalfunctionNot Used SL1 Loop Pump 1 Aux Heat 3
DHW LimitHWL Thermistor
>130°FHWL Thermistor
>130°FNot Used Loop Pump 2 Aux Heat 4
DHW OffDHW Pump Switch Off
DHW Pump Switch Off
– – –
LED Definitions and DiagnosticsStandard Microprocessor
TroubleshootingIf control responds improperly:4.
Ensure that component being controlled is •
functioning (compressor, blower, reversing valve,
etc.).
Ensure that wiring from control to the component •
is functioning (refer to the LED Definition table
below and use the diagnostic outputs mode).
If steps above check properly, replace unit control.•
33
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Water Coil MaintenanceKeep all air out of the water. An open loop system 1.
should be checked to ensure that the well head is not
allowing air to infiltrate the water line. Lines should
always be airtight.
Keep the system under pressure at all times. It is 2.
recommended in open loop systems that the water
control valve be placed in the discharge line to prevent
loss of pressure during off cycles. Closed loop systems
must have positive static pressure.
NOTES: On open loop systems, if the installation is in
an area with a known high mineral content (125 PPM or
greater) in the water, it is best to establish with the owner a
periodic maintenance schedule so the coil can be checked
regularly. Should periodic coil cleaning be necessary, use
standard coil cleaning procedures which are compatible
with either the cupronickel or copper water lines. Generally,
the more water flowing through the unit the less chance for
scaling.
Other Maintenance Filters
Filters must be clean to obtain maximum performance.
They should be inspected monthly under normal operating
conditions and be replaced when necessary. Units should
never be operated without a filter.
Obtaining PartsWhen ordering service or replacement parts, refer to the
model number and serial number of the unit as stamped on
the serial plate attached to the unit. If replacement parts
are required, mention the date of installation of the unit
and the date of failure, along with an explanation of the
malfunctions and a description of the replacement parts
required.
In-Warranty Material ReturnMaterial may not be returned except by permission
of authorized warranty personnel. Contact your local
distributor for warranty return authorization and assistance.
CAUTION: Fin edges are sharp.
Preventative MaintenanceCondensate Drain
In areas where airborne bacteria produce a slime in the
drain pan, it may be necessary to treat chemically to
minimize the problem. The condensate drain can pick up
lint and dirt, especially with dirty filters. Inspect twice a
year to avoid the possibility of overflow.
Blower Motors
Blower motors on most air handlers are equipped with
sealed ball bearings and require no periodic oiling.
Hot Water Generator Coil
See Water Coil Maintenance section above.
Air Coil
The air coil must be cleaned to obtain maximum
performance. Check once a year under normal operating
conditions and, if dirty, brush or vacuum clean. Care must
be taken not to damage the aluminum fins while cleaning.
Replacement Procedures
34
NSZ/NDZ INDOOR SPLIT INSTALLATION MANUAL
Service Parts List
Single Speed Split Units Dual Capacity Split Units
022 030 036 042 048 060 070 026 038 049 064 072
Co
mp
ress
or
Compressor 34P581-01 34P582-01 34P583-01 34P578-01 34P579-01 34P580-01 34P561-05 34P585-01 34P573-01 34P574-01 34P575-01 34P586-01
Run Capacitor 16P002-18 16P002-20 16P002-21 16P002-25 16P002-24 16P002-19 16P002-20 16P002-21 16P002-24
Sound Jacket 92P504A05 92P504A16 92P504A16
Power Harness 11P781-01 11P781-01
Solenoid Harness N/A 11P782-01
Re
frig
era
tio
n
Co
mp
on
en
ts
Accumulator 36P509-02 36P509-01 36P509-02 36P509-01
Coax 62P504C01 62P541B01 62P542B01 62P543B01 62P555-01 62P504C01 62P542B01 62P543B01 62P555-01
TXV 33P609-01 33P609-03 33P609-05 33P609-06 33P609-01 33P609-03 33P609-05 33P609-06
Reversing Valve 33P506-04 33P503-05 33P526-04 33P506-04 33P503-05 33P526-04
Filter Dryer 36P500B01 36P500B02 36P500B01 36P500B02
Ho
t W
ate
r G
en
era
tor
Hot Water Generator 62P516-05 62P516-03 62P516-05 62P516-03
Hot Water Generator Pump 24P501-02 24P501-02
Ele
ctr
ical
Comfort Alert 19P571-01 19P571-02
Contactor 13P004A03 13P004A03
Transformer 15P501B01 15P501B01
3 Pole Power Block 12P503-06 12P503-06
2 Pole Screw Term. Block 12P500A01 12P500A01
Status Light Board 17P503-02 17P503-02
Harness, Status Light Board 11P783-01 11P783-01
Premier Board 17P513-07 17P513-07
Se
nso
rs &
S
afe
tie
s
Freeze Detection Thermistor 12P505B03 12P505B03
HWL Thermistor 12P505B02 12P505B02
High Pressure Switch 35P506B02 35P506B02
Low Pressure Switch 35P506B01 35P506B01
Part numbers subject to change 6/12/06
Product: Envision Series NSZ/NDZ
Type: Geothermal/Water Source Indoor Split Heat Pump
Size: 2-6 Ton Single Speed
2-6 Ton Dual Capacity
Document: Installation Manual
Manufactured by
WaterFurnace International, Inc.
9000 Conservation Way
Fort Wayne, IN 46809
www.waterfurnace.com
©2010 WaterFurnace International, Inc., 9000 Conservation Way, Fort Wayne, IN 46809-9794. WaterFurnace has a policy of continual product research and development and
reserves the right to change design and specifications without notice.
IM1003SN 08/10